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This gives a clear speed and security improvement. Siphash is both faster and is more solid crypto than the aging MD5. Rather than manually filling MD5 buffers, for IPv6, we simply create a layout by a simple anonymous struct, for which gcc generates rather efficient code. For IPv4, we pass the values directly to the short input convenience functions. 64-bit x86_64: [ 1.683628] secure_tcpv6_sequence_number_md5# cycles: 99563527 [ 1.717350] secure_tcp_sequence_number_md5# cycles: 92890502 [ 1.741968] secure_tcpv6_sequence_number_siphash# cycles: 67825362 [ 1.762048] secure_tcp_sequence_number_siphash# cycles: 67485526 32-bit x86: [ 1.600012] secure_tcpv6_sequence_number_md5# cycles: 103227892 [ 1.634219] secure_tcp_sequence_number_md5# cycles: 94732544 [ 1.669102] secure_tcpv6_sequence_number_siphash# cycles: 96299384 [ 1.700165] secure_tcp_sequence_number_siphash# cycles: 86015473 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Miller <davem@davemloft.net> Cc: David Laight <David.Laight@aculab.com> Cc: Tom Herbert <tom@herbertland.com> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.